328 



SPOROZOA. 



II. Subclass CNIDOSPORIDIA Doflein, 

 1901. 



This subclass includes organisms which are amoeboid during 

 the trophic phase, and of which dissemination takes place 

 through resistant spores, which are provided with one to four 

 polar capsules. Each spore contains one to many sporoplasms 

 or generative cells, and the spore -membrane may be complete 



.st.f5. 



Fig. 163.^ — Some typical Cnidospobidia and their spores. A, Chloro- 

 myxum leydigi Mingazzini ; B, C, Leptotheca agilis Thelohan 

 in different stages of locomotion ; D, spore of the same ; 

 E, spore of Henneguya psorospermica Thelohan, stained 

 section, ect., ectoplasm ; end., endoplasm ; f.g., fat- 

 globules ; n., nuclei ; p.c, polar capsules ; ps., pseudo- 

 podia ; s., sutural plane ; sp., spores ; st.ps., stylar 

 pseudopodium ; v., vacuole. (From Reichenow, after 

 Doflein and Thelohan.) 



or be bivalved or trivalved. Each polar capsule contains 

 a long coiled filament, which, when extruded, serves to attach 

 the spore to the intestinal wall till the amoeboid body can 

 escape from the spore and infect the tissues of the new host. 



Schaudinn (1900) divided the Sporozoa into two sub- 

 classes, the Telosporidia and the Neosporidia. The Telo- 

 SPORIDIA include the Gregarinida, Coccidia, and H^mo- 

 SPORIDIA, and are a uniform group, characterized by having 



